... they concluded they had methyl 12- 0x0-cis-9-dodecenoate. - In 1977, Kajiwara et a1.8 described the preparation of small amounts of methyl 12-0x0-cis-9- - and of methyl 12-0x0-trans- 10-dodecenoates by the oxidation, with chromium trioxide in ... established the position and configuration of the unsaturation by H and 13C M spectroscopy. We have also observed, by ... Page 8. 192 RAKOFF, ADLOF, AND EMKEN Experimental Instruments ...